well, i couldn't care less for the success rate if the "quick" really meant quick
because i can craft it faster via normal synthesis :P
i always just record macro like 0,0, steady hands, craft, delay
and doesn't loose a single item, the delay between two crafts during "quick" synthesis
is just tooooooooo looooooooooong, the bloody moko grass>yarn>cloth almost killed me yesterday :P

i would redesign it completely, like set materials for 20 or so items and craft it like always in one go
the chance for HQ items could be changed to something like
if you get quality to 100% you will get 10% of items in HQ